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9.33.6.7.(7) | Application | Intent |
| OH1 | OS2 | OS3 |
| Objective | OS3 Safety in Use |
| Attribution | |
| Application | Application 1: Underground ducts, in air duct distribution systems
serving heating systems in which the rated heat input does not exceed 120
kW and serving only one dwelling unit,
in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]. Application 2: This also applies to ventilation ducts and their fittings,
as stated in Sentence 9.32.3.11.(1). |
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| Intent | Intent 1: To limit the probability of the entry of sewer gases into
duct systems, which could, on system operation, lead to the distribution of
sewer gases throughout living spaces, which could lead to harm to persons.
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